EVALUATION OF SILICA NANOPARTICLE COLLOIDAL STABILITY WITH A FIBER OPTIC QUASI-ELASTIC LIGHT SCATTERING SENSOR
| Autor: | Lucimara Gaziola de la Torre, Carlos Kenichi Suzuki, Marco César Prado Soares, Egont Alexandre Schenkel, Eric Fujiwara, Matheus Kaue Gomes, Matheus dos Santos Rodrigues |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Optical fiber sensor Scanning electron microscope Scattering 020209 energy General Chemical Engineering Colloidal silica Quasi-Elastic Light Scattering Nanoparticle 02 engineering and technology Light scattering Colloidal stability Colloid Light intensity Chemical engineering 020401 chemical engineering Fiber optic sensor 0202 electrical engineering electronic engineering information engineering TP155-156 0204 chemical engineering |
| Zdroj: | Brazilian Journal of Chemical Engineering, Vol 36, Iss 4, Pp 1519-1534 (2020) Brazilian Journal of Chemical Engineering v.36 n.4 2019 Brazilian Journal of Chemical Engineering Associação Brasileira de Engenharia Química (ABEQ) instacron:ABEQ |
| ISSN: | 1678-4383 |
| Popis: | Colloidal silica is an important biocompatible, inert and non-toxic material for imaging, therapy, and drug delivery biomedical applications. In this context, the evaluation of colloidal suspensions and their stabilities by a Fiber Optic Quasi-Elastic Light Scattering sensor is proposed. Two different silica nanoparticles were prepared and characterized by scanning electron microscopy and X-ray diffraction, being completely amorphous, with mean diameters of 125 and 159 nm and average specific weight of 1.94 g.cm-3. The nanoparticles were dispersed in deionized water in different concentrations ranging from 0 to 2% (m/m), resulting in suspensions with mean kinematic viscosity of 0.009157 cm².s-1. The sensor showed different sensitivities regarding concentrations and diameters, with an increase in the light intensity dispersion caused by the scattering. A decreasing tendency of the decay rate of the autocorrelation function of the light intensity signal was verified with the variation of pH, and this decay rate also showed an abrupt decrease with the enhancement of the ionic strength, detecting the limits of the colloidal stability. This work presents a simple and reliable methodology for the colloidal assessment in a low-cost and minimally invasive way, easily extendable for different chemical and biological systems. |
| Databáze: | OpenAIRE |
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